System, management device, and aircraft

1. A system, comprising: a plurality of aircrafts, each of which has an antenna for forming a communication area on a ground to provide a radio communication service to a user terminal in the communication area; and a management device that manages the plurality of aircrafts, the management device being configured and adapted to select an aircraft of the remote operation target from the plurality of aircraft, transmit a remote operation signal to an aircraft selected as a remote operation target from the plurality of aircrafts, and acquire state information indicating a state of each of the plurality of aircrafts from each of the plurality of aircrafts, and wherein each of the plurality of aircrafts is configured and adapted to cause the aircraft to fly based on the remote operation signal received from the management device when the aircraft is selected as the remote operation target, and cause the aircraft to fly in tune with other aircraft selected as the remote operation target when the aircraft is not selected as the remote operation target, cause the aircraft to fly in a flying pattern corresponding to a flying pattern of the other aircraft on the sky of a covering target area of the aircraft so as to cover the covering target area of the aircraft when other aircraft selected as the remote operation target is circling in the sky over a covering target area of the other aircraft based on the remote operation signal, and when a parent aircraft, which is an aircraft selected as the remote operation target among the plurality of aircrafts, flies based on the remote operation signal, and child aircrafts, which are aircrafts other than the parent aircraft, fly in tune with the parent aircraft, switch the remote operation target from the parent aircraft to a child aircraft in response to the state information of the child aircraft indicating that the state of the child aircraft is a bad state.

2. The system according to claim 1 , wherein, when the child aircraft flies in tune with the parent aircraft according to a first tuning condition, the state information of the child aircraft indicates that the state of the child aircraft is the bad state, and thus in a case where the remote operation target switches from the parent aircraft to the child aircraft, and the child aircraft after switching flies in tune with the parent aircraft after switching according to a second tuning condition different from the first tuning condition.

3. The system according to claim 2 , wherein the first tuning condition includes following a speed of the parent aircraft, and the second tuning condition does not include following the speed of the parent aircraft.

4. The system according to claim 1 , wherein when the aircraft is caused to fly in tune with other aircraft, the plurality of aircraft are further configured and adapted to cause the aircraft to fly based on a control signal received from the other aircraft selected as the remote operation target.

5. The system according to claim 2 , wherein when the aircraft is caused to fly in tune with other aircraft, the plurality of aircraft are further configured and adapted to cause the aircraft to fly based on a control signal received from the other aircraft selected as the remote operation target.

6. The system according to claim 3 , wherein when the aircraft is caused to fly in tune with other aircraft, the plurality of aircraft are further configured and adapted to cause the aircraft to fly based on a control signal received from the other aircraft selected as the remote operation target.

7. The system according to claim 4 , wherein the control signal instructs a flying pattern in which the other aircraft has flown based on the remote operation signal, and when the aircraft is caused to fly in tune with other aircraft, the plurality of aircraft are further configured and adapted to cause the aircraft to fly based on the flying pattern.

8. The system according to claim 1 , wherein when the aircraft is caused to fly in tune with other aircraft, the plurality of aircraft are further configured and adapted to cause the aircraft to follow the other aircraft selected as the remote operation target.

9. The system according to claim 2 , wherein when the aircraft is caused to fly in tune with other aircraft, the plurality of aircraft are further configured and adapted to cause the aircraft to follow the other aircraft selected as the remote operation target.

10. The system according to claim 3 , wherein when the aircraft is caused to fly in tune with other aircraft, the plurality of aircraft are further configured and adapted to cause the aircraft to follow the other aircraft selected as the remote operation target.

11. The system according to claim 8 , wherein when the aircraft is caused to fly in tune with other aircraft, the plurality of aircraft are further configured and adapted to cause the aircraft to fly such that a distance to the other aircraft selected as the remote operation target does not become shorter than a preset distance.

12. The system according to claim 1 , wherein the management device includes a signal receiving unit that receives the remote operation signal from a remote operation device, and wherein the signal transmitting unit transmits the remote operation signal received by the signal receiving unit to the aircraft selected as the remote operation target.

13. The system according to claim 2 , wherein the management device is further configured and adapted to receive the remote operation signal from a remote operation device, and transmit the remote operation signal to the aircraft selected as the remote operation target.

14. The system according to claim 3 , wherein the management device is further configured and adapted to receive the remote operation signal from a remote operation device, and transmit the remote operation signal to the aircraft selected as the remote operation target.

15. The system according to claim 1 , wherein the management device is further configured and adapted to acquire a first weather condition of a flying area where a first aircraft group, including a first parent aircraft which is an aircraft selected as the remote operation target and a first child aircraft which is an aircraft flying in tune with the first parent aircraft, flies, and a second weather condition of a flying area where a second aircraft group, including a second parent aircraft and a second child aircraft, flies, and cause the first child aircraft to fly in tune with the second parent aircraft in a case where the first weather condition and the second weather condition satisfy a preset condition.

16. The system according to claim 2 , wherein the management device is further configured and adapted to acquire a first weather condition of a flying area where a first aircraft group, including a first parent aircraft which is an aircraft selected as the remote operation target and a first child aircraft which is an aircraft flying in tune with the first parent aircraft, flies, and a second weather condition of a flying area where a second aircraft group, including a second parent aircraft and a second child aircraft, flies, and cause the first child aircraft to fly in tune with the second parent aircraft in a case where the first weather condition and the second weather condition satisfy a preset condition.

17. The system according to claim 3 , wherein the management device is further configured and adapted to acquire a first weather condition of a flying area where a first aircraft group, including a first parent aircraft which is an aircraft selected as the remote operation target and a first child aircraft which is an aircraft flying in tune with the first parent aircraft, flies, and a second weather condition of a flying area where a second aircraft group, including a second parent aircraft and a second child aircraft, flies, and cause the first child aircraft to fly in tune with the second parent aircraft in a case where the first weather condition and the second weather condition satisfy a preset condition.

18. A management device for managing a plurality of aircrafts, each of which has an antenna for forming a communication area on a ground to provide a radio communication service to a user terminal in the communication area, the management device being configured and adapted to: select an aircraft of a remote operation target from the plurality of aircrafts; transmit a remote operation signal to the aircraft selected as the remote operation target from the plurality of aircrafts; cause an aircraft not selected as the remote operation target from the plurality of aircrafts to fly in tune with the aircraft selected as the remote operation target; acquire state information indicating a state of each of the plurality of aircrafts from each of the plurality of aircrafts; and when a parent aircraft, which is an aircraft selected as the remote operation target among the plurality of aircrafts, flies circling in a sky of a covering target area of the parent aircraft based on the remote operation signal, and child aircrafts, which are aircrafts other than the parent aircraft, fly in tune with the parent aircraft in a predetermined flying pattern in tune with the parent aircraft in the sky of a covering target area of the child aircrafts to cover the covering target area of the child aircrafts, switch the remote operation target from the parent aircraft to a child aircraft in response to the state information of the child aircraft indicating that the state of the child aircraft is in a bad state.